Governor.



' -sup-ported upon a lug 25 ydepending from 'ward the cylinder, cupped'head, l'and the lever is connected with ency to swing in the direction of the arrow i the several so T engagement by torce-closure, so that there 1s the lever' 27 'constitute,

"member 2-9projecting`f-rom the forward end of the cylinderl. From the upper arm of "rangement-the pressure in the cylinder 13 gerf2, which slides in a sleeve on the arm p licated 4 movements of the lever 2 -to-n to the right, or to the .torce to operate the governor-mechanism and lpensati'ng for such increase in pressure, so

the cylinder 13 the sleeve. The other arm 26 of the differential lever engages the upper end of a lever 27, by which .the differential lever is connected with the pressure-controlled piston 15.

Thefl'ever`27 ,is fulcrumed by .means of lmife-edige'piv'ots 28 seatedl in a bearingthis lever an adjusting-screw 30 projects tothis screw having a the piston 15 by means ofa spindle-shaped rod or link 31, which is seated. in the screw- -head,'.andinthe concave interior of .the piston, as shown in Eig. 1.l Through this arcauses the lever 2.7 to have a. constant tendin Fig. 1,- and pressure is thus transmitted vthroughthedierential lever to the adjusting-screw 22, and thence to the arm 20. This pressure is constantly opposed, however, by the action of a spring-pressed plum-5 20 and, engages alug `33 projecting from the arm 19. Through the opposed action of this springplunger and the lpneumatic piston parts of the vmechanism above described vare kept constantly in operative nolost motion, and so that the necessity of a'ccu'rately-itted closed joints, or other com-- and expensive arrangements, is obviated.

To partly balance the pressure against the piston 15, the governor is provided, as in .my said" patent, with a s ring affecting the To this end the lower'armof the lever has a -knife-edge bearing against apli'lnger 34 upon which is a coiled compression-spring 35,V seated against lan adjusting-screw 36. 'This arrangement tends constantly to move the pisposition of Fig. 1 andthe-spring is adjusted so as nearly to balance the -pneu-matic pressure in the cylinder, leaving, however, a small -margin of control'the throttle-valve. .As the pressure thexspring 35 increases in proportion as the springl is compressed, I disclosed, in my said patent, mechanism associated with this spring and the pneumatic piston for comtion of'the dot-and-dasli line in Fig. 1, the two members being thus at an obtuse angle to each other. The effective length of the lever 27 with respect to the piston 15 is thusy pistoAnmoves to the left, however, the effective length of this lever rapidly increases, thus compensating for the increased pressure of the spring 35. In this connection the adjusting-screw 30 'constitutes a valuable feature of the arrangement. lt is not practical to produce springs, such as the spring 35, in quantity without substantial variation in their elasticity, and this` screw, permts an adjustment of each gov-- ernor in accordance with the' individual characterstics of the spring employed therein. By the use of this screw the angle bctween the elements of the linkage may be varied, thus varying thc compensating action to suit each case.

As in the device disclosed in my said pat-I ent, the adapt it bothl for a given normal compression, and for a given normal speed in the compressor, these adjustments being required according to the normal output oi the compressor, and tl e degree of compression and volume of compressed air required. The adjustment for compression is provided by the screw 36, acting upon the spring 235', while the adjustment i'or speed is provides] by the 'screw 22, the latter regulating-the position of the throttle-valve for any given position of the speed-controlled mem-ber and the pressure-controlled*member of the governor. As in said prior patent, 'I also employ an adjustable stop for limiting the action of the pressure-controlled member. This stop is in the form of a rod 37, which is pivoted to thev upper end of the lever 27 'and provided with an adjustable stop-nut 38 adapted to engage a lug 39, through which the rod 37 passes loosely. By this arrangement the left-hand movement of the lever 27 may be limited, so as to prevent\ the throttle-valve from being closed, by this means, beyond a predetermined degree, thus 'insuring at .least a minimum speed in the compressor and preventing it from coming completely to rest. i

I claim l. A governor for air-compressors having, in combination, a throttle-valve for controlas to render the governor sensitive through In the present device the same result is accomplished. Consideging Fig. 1, Vit will be apparent that in the position of the parts there shown, l corresponding to va minimum pressure in ,l and a minimum degree'of l con'iprcssion of the spring 35, the rod 31 and l in effect, a linkage l of which one member extends in thedirecl ling the operation of a compressor, a 4spring tending` constantly to open the throttlevalve, a pressure controlled member subjected to and movable in accordance with the pressure produced by the air-compressor, and connections between the valve and said member comj'n'ising a train of levers maintained constantly in forcible engagement with each other by the opposed action of said spring and said member.

2. A governor for air-compressors having,

small in this position of the parts. As the present governor is adjustable to levers maintained constantly in forcible en* gagementwith each other by the opposed action of said resilient device and said pres' surecontrolled member, one 'of said levers being fulcrumed upon `the speed-controlled member soy as to operate ditlj'erentially according to the movements of both of said members.

3. A governor for air-compressors having, in combination, a throttle-valve forcontrol-v ling the operation of a compressor, a speedcontrolled member movable in accordance with variations in thefspeed of the compressor, a pressure-controlled membersubjected to, and movable in accordance With, tl'ie pressure produced by the compressor, and connections between Vthe ,valve and said Amemt bers comprising a lever fulcrume'd on the speed-controlled member and connected, at one end, with the valve, a second ylever co'- operating with theother end\of the firstmeiitioned lever, and a link pivotlly engag`` ing the second lever and connecting it with tbe pressure-controlled member, the arm of the second lever which vcooperates with said Gopies of lthis patent may be obta'iicfor five' cents each, by' address'i'ngkthe Commissioner o`f1Patienits,

link lying at an' obtuse angle with the link,

'and a spring. coperating. Vlever and acting in opposition to the pres-j 40/ surefcontrolled. member. v

4. A governor for air-compressors having, in combination, a throttle-valve forcontrol-y ling the operation of a compressor, a speedy controlled member movable in accordance with `variations in the speed of thev compressor, a pressure-controlled member subjected to, and movable in accordance with, the pressure produced by the compressor, and connections between the valve and said members comprising a lever fulcrumed on the speedecontrolled member and connected, at one end, with the valve, a second lever cooperating with the other end of the first-- mentioned lever, and a link connecting the second lever and the pressure-controlled member, the arm of the second lever which cooperates With vsaid link lying at an obtuse angle with the link and being adjustable to vary said angle fora given position of the pressure-controlled member, and a spring co-c loperating with the second leverand acting Ln oppositiony to the pressure-controlled 'mem- 5.` A governor for air-compressors having, in combination, arotary throttle-valve for controlling the operation of-the compressor, an arm rigidly connected with the throttlevalve, a spring engaging said arm and tending constantly to move it in 'a direction to open the throttle-valve, a speed-controlled member movable in accordance-With Variations of the speed 'of the compressor, a pressure-controlled member subjected to and movable in accordance with the pressure produced by. the compressor, and connec-s -tions between said arm land-said members comprising a lever fulcrumed on the speedi controlled member and engagin'y said arm, said'connections being maintaine constantly irl-forcible contact by the opposed 'actinof the spring and the, pressure.- controlled member. y

i JOHN L. OSBORNE.

Witnesses:

' FAR'NUM F, DoisEY, lD. GURNEE.-

y Washington, D. C. 

